Asymmetrical post query.

asymmetrical-query.php

$args = array( 'post_type' => 'video', 'posts_per_page' => 10,);

$the_query = new WP_Query( $args );

echo '<section id="our-work">';

if ( $the_query->have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post();
    $counter += 1;

    if ($counter == 1 || $counter == 4 || $counter == 6 || $counter == 9) {
      echo '<div class="row">';
    }

    if($counter == 4 || $counter == 5 || $counter == 9 || $counter == 10) : 

    echo '<div class="span6">';
    the_post_thumbnail();
    echo '</div>';

    else:

    echo '<div class="span4">';
    the_post_thumbnail();
    echo '</div>';

    endif;

    if ($counter == 3 || $counter == 5 || $counter == 8 || $counter == 10) {
      echo '</div>';
    }

 endwhile; endif;

echo '</section>';